.TH std::basic_ostream::swap 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::basic_ostream::swap \- std::basic_ostream::swap

.SH Synopsis
   protected:                        \fI(since C++11)\fP
   void swap( basic_ostream& rhs );

   Calls basic_ios::swap(rhs) to swap all data members of the base class, except for
   rdbuf(), between *this and rhs. This swap function is protected: it is called by the
   swap functions of the swappable output stream classes std::basic_ofstream and
   std::basic_ostringstream, which know how to correctly swap the associated
   streambuffers.

.SH Parameters

   rhs - a basic_ostream of the same type to swap with

.SH Example


// Run this code

 #include <iostream>
 #include <sstream>
 #include <utility>

 int main()
 {
     std::ostringstream s1("hello");
     std::ostringstream s2("bye");

     s1.swap(s2); // OK, ostringstream has a public swap()
     std::swap(s1, s2); // OK, calls s1.swap(s2)

 //  std::cout.swap(s2); // ERROR: swap is a protected member

     std::cout << s1.str() << '\\n';
 }

.SH Output:

 hello
